The southbound lanes of Interstate 255 near Dupo were temporarily closed Thursday morning because of a motorcycle crash.
According to police radio traffic, the victim was alive and conscious when help arrived. But they said he was suffering from a head injury that was considered to be potentially life-threatening.
According to Illinois State Police reports, a 33-year-old man from Columbia was riding a 1993 Harley-Davidson motorcycle when he rear-ended a 1992 Ford Ranger pick-up driven by a 67-year-old man from Swansea.
Police said it is unknown at this time why the motorcycle was unable to stop in time. The accident report did not say if the rider was wearing a helmet.
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The crash happened just before 7 a.m. The interstate was re-opened about an hour later. According to the St. Clair County Emergency Management Agency, traffic at one point was backed up all the way to Illinois 15.
The motorcycle could be seen laying on its side across two lanes of traffic as the victim was loaded onto an ambulance that was parked a few feet away.
Meanwhile, a medical evacuation helicopter was parked on the highway about 50 yards from the crash site.
The police report did not list any injuries to the driver of the pick-up.